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Polyolefins adhesive tape to the pipeline cathodic protection current research progress of shielding

by:Yourijiu     2021-02-03





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the pipe joint use external anti-corrosion coating and cathodic protection is the most commonly used control outside the long-distance pipeline corrosion, the most appropriate protective measures, the current commonly used polyolefins adhesive tapes have 3 PE anticorrosion layer outside the pipeline anticorrosion coating, 3PE) And polyethylene anticorrosive layer 2 ( 2PE) , fusion bonded epoxy powder ( 领域) , coal tar, coal tar epoxy cold wind belt and polyethylene tape, etc.



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in engineering applications it gradually found that when the applied current cathodic protection for pipeline protection, pipeline anticorrosion coating outside, especially after the insulation of the anti-corrosion layer debonding, would trigger a shielded cathodic protection current, make the pipe can not get effective protection current. Eventually led to the pipeline corrosion, cause safety accidents.



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this article from outside the pipeline anticorrosion coating to cathodic protection current blocking causes, manifestations, corrosion harm and solution of such aspects as research progress are reviewed.



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the overseas research progress in 1988, the U. S. pipeline research council proposed pipeline contacts - for the first time Zhang ying ying engineers, external anticorrosion coating of cathodic protection current shielding problem, and argued that the cathodic protection current block is pipeline corrosion and stress corrosion cracking ( 鳞状细胞癌) The main reason.

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